Restoration increases transient storages in boreal headwater streams
|Author:||Marttila, Hannu1; Turunen, Jarno2,3; Aroviita, Jukka2;|
1Water Resources and Environmental Engineering Research Unit, University of Oulu, Oulu, Finland
2Finnish Environment Institute, Freshwater Centre, Oulu, Finland
3Department of Ecology and Genetics, University of Oulu, Oulu, Finland
4Metsähallitus, Parks & Wildlife Finland, , Pudasjärvi, Finland
|Persistent link:|| http://urn.fi/urn:nbn:fi-fe201901021162
John Wiley & Sons,
|Publish Date:|| 2019-09-27
Bed siltation can drastically alter the physical conditions of headwater streams and is therefore a stressor for stream ecosystems. We studied 32 headwater streams that represented near‐natural (reference; N = 11), sediment‐impacted (N = 12), or wood‐ (N = 4) or stone‐restored (N = 5) streams to quantify how extensive siltation and restoration with either large woody debris (LWD) or boulder structures influence transient storage conditions. We carried out repeated stream tracer experiments, field measurements of habitat characteristics, and numerical simulations to determine the effects of siltation and restoration on total transient storage. Compared with reference streams, impacted streams had a smaller storage zone cross‐sectional area (As/A) ratio and fraction of median travel time due to transient storage (F200), whereas restored streams had transient storage conditions similar to near‐natural conditions. Both of the two restoration methods had positive but differing impacts on bed sediment and transient storage properties. The LWD restoration created diverse total transient storage conditions, whereas boulder restoration decreased fine sediment cover. Addition of both LWD and boulders could thus aid the recovery of headwater streams from excessive sediment input and increase transient storage and in‐stream habitat complexity.
River research and applications
|Pages:||1278 - 1285|
|Type of Publication:||
A1 Journal article – refereed
|Field of Science:||
218 Environmental engineering
This work was funded by the Academy of Finland (AKVA Grant 263597).
© 2018 John Wiley & Sons, Ltd. This is the peer reviewed version of the following article: Marttila H, Turunen J, Aroviita J, et al. Restoration increases transient storages in boreal headwater streams. River Res Applic. 2018;34:1278–1285, which has been published in final form at https://doi.org/10.1002/rra.3364.
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